Multilayer gusseted bag with reverse fin seals,申请号US19830518781-传众专利搜索

Multilayer gusseted bag with reverse fin seals

申请公布号：US4761080(A)

申请号：US19830518781

申请日期：1983.07.29

申请公布日期：1988.08.02

申请人：

W. R. GRACE & CO., CRYOVAC DIV.

发明人：SCHIRMER, HENRY G.

分类号：B32B27/08;B65D30/00;B65D30/08;B65D30/20;(IPC1-7):B65D30/20

主分类号：B32B27/08

摘要：A gusseted bag is provided which, according to a preferred mode, is constructed of thermoplastic multilayer film with an outer sealing layer and has a seamless folded bottom and reverse-fin-sealed sides. Advantageously, the starting material for such bags is lay-flat tubular film cut longitudinally along the center of one side, which is folded and joined to itself along each side of the longitudinal cut, respectively. In an alternate mode wherein the bag bottom is not seamless but is end-sealed, the bag is constructed by joining together two such lay-flat tubes along each side of their longitudinal cuts, respectively.